# include <iostream>
# include <math.h>
# define PI 3.1415926
# define RTA 57.2958
using namespace std;

const int angle180 = 180;

int main()
{
    int a = -10;
    double a2 = pow(a,2);
    double sqrta2 = sqrt(a2);
    int b = 1;
    cout << "RTA= " << RTA << endl; 
    cout << "abs(a)=" << abs(a) << endl;
    cout << "sin(180)=" << sin(PI) << endl;
    cout << "cos(180)=" << cos(PI) << endl;
    cout << "atan(1) = " << atan(b)*RTA << endl;
    cout << "sqrt((10)^2)=" << sqrta2 << endl;
    cout << sqrt(a2) << endl;
    return 0;
};
